[chickensmith]

The pack and play is a good idea. Or an ex pen. Try giving him a tshirt of yours or your wife's. He's still a baby so he's missing having litter mates/mama. Potty training is tough. Consistency is key. Every time he goes potty in the house take him directly outside and say something like "potty outside" let him down and then take him back inside and put him in his crate or ex pen. Leave him there for about 15 minutes then take him back outside and say "potty outside" . It is time consuming but if you are consistent and don't give in he will get it eventually. While inside if you cannot keep eyes on him at all times confine him to the ex pen or crate. Some suggest having him tethered to whomever is with him at the time. Keeping him confined keeps him from marking up the whole house and also will keep him safe. This way u know he's not chewing/swallowing something he shouldn't. They r quick little buggers! One last thing I want to mention is to be sure he is eating a few times through the day. Hypoglycemia is common in these tiny pups. If u notice extreme lethargy, swipe some Karo syrup on his gums and get him to the vet. Be sure to have a regular vet as well as an emergency vet on hand.
As he gets older and gets better with the potty business you can slowly give him more freedom in your home!
After all that.....he is absolutely adorable! Congrats!